The term 'Truck Unit' is a job description for a person who operates a truck. This person is responsible for loading, unloading, and transporting goods from one place to another. They must also ensure that the truck is in good working condition and that all safety regulations are followed. The crossword solutions for this term are TON, which stands for 'Tons of Goods'. This indicates that the truck unit is responsible for transporting large amounts of goods.